The present invention is directed to expression vectors comprising a polynucleotide that encodes a human telomerase reverse transcriptase (hTRT) protein, variant, or fragment. The present invention is also directed to host cells that comprise expression vectors comprising a polynucleotide that encodes...http://www.google.com.au/patents/US6921664?utm_source=gb-gplus-sharePatent US6921664 - Telomerase
